1. Laboratory of Medicinal Chemistry, Rega Institute, Minderbroedersstraat 10, B-3000 Leuven, Belgium
2. Laboratory of Analytical Chemistry and Medicinal Fysicochemistry, Katholieke Universiteit Leuven, Van Evenstraat 4, B-3000 Leuven, Belgium
3. Laboratoire de Biophysique, Muséum National D'Histoire Naturelle, rue Cuvier 43, F-75231 Paris, France